U.S. patent application number 13/682080 was filed with the patent office on 2013-07-11 for magnetization device for a nuclear magnetic flow meter.
This patent application is currently assigned to KROHNE AG. The applicant listed for this patent is Krohne AG. Invention is credited to Ariel de Graaf, Cornelius Johannes Hogendoorn, Jan Teunis Aart Pors, Marco Leendert Zoeteweij.
Application Number | 20130176024 13/682080 |
Document ID | / |
Family ID | 48743481 |
Filed Date | 2013-07-11 |
United States Patent
Application |
20130176024 |
Kind Code |
A1 |
Pors; Jan Teunis Aart ; et
al. |
July 11, 2013 |
MAGNETIZATION DEVICE FOR A NUCLEAR MAGNETIC FLOW METER
Abstract
A magnetization device for permeation of a multiphase fluid
flowing through a measurement tube of a nuclear magnetic flow meter
with a magnetic field which is homogenous at least in one plane,
with a plurality of permanent magnets for generation of a magnetic
field and with a carrier, the carrier having at least one magnet
receiver, each magnet receiver accommodating at least one of the
permanent magnets, the shape of the magnet receivers and of the
permanent magnets allowing movement of the permanent magnets in the
magnet receivers only in one direction and the permanent magnets
being by the magnet receivers formed by hollow profiles. The hollow
profile magnet receivers can be receiving tubes for the magnets
that can be turned around their longitudinal axis or the profiles
can have a rotatable adapter for the magnets so that a first
shimming action can be achieved with the profiles.
Inventors: |
Pors; Jan Teunis Aart;
(Oud-Beijerland, NL) ; Hogendoorn; Cornelius
Johannes; (Spijk, NL) ; de Graaf; Ariel;
(Utrecht, NL) ; Zoeteweij; Marco Leendert;
(Hendrik-Ido-Ambacht, NL) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Krohne AG; |
Basel |
|
CH |
|
|
Assignee: |
KROHNE AG
Basel
CH
|
Family ID: |
48743481 |
Appl. No.: |
13/682080 |
Filed: |
November 20, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
13676685 |
Nov 14, 2012 |
|
|
|
13682080 |
|
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Current U.S.
Class: |
324/306 |
Current CPC
Class: |
G01F 1/716 20130101;
G01F 1/74 20130101 |
Class at
Publication: |
324/306 |
International
Class: |
G01F 1/716 20060101
G01F001/716 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 20, 2011 |
DE |
10 2011 118 839.1 |
Claims
1. A magnetization device for permeation of a multiphase fluid
flowing through a measurement tube of a nuclear magnetic flow meter
with a magnetic field which is homogenous at least in one plane,
comprising: a plurality of permanent magnets for generation of a
magnetic field and a carrier, the carrier having a plurality of
magnet receivers, each magnet receiver accommodating at least one
of the permanent magnets, the shape of the magnet receivers and of
the permanent magnets allowing axial movement of the permanent
magnets in the magnet receivers, wherein the magnet receivers are
hollow profiles that hold the permanent magnets so as to produce
said magnetic field which is homogenous at least in one plane.
2. The magnetization device in accordance with claim 1, wherein the
hollow profiles have a lining which reduces friction in movement of
the permanent magnets in the hollow profiles.
3. The magnetization device in accordance with claim 1, wherein the
permanent magnets are fixed in the hollow profiles by a hardened
liquid.
4. The magnetization device in accordance with claims 1, wherein
the carrier has a plurality of receiving tubes, wherein each of the
receiving tubes contains a respective hollow profile for
accommodating said at least one of the permanent magnets.
5. The magnetization device in accordance with claim 4, wherein the
carrier has at least one disk as a holder of the receiving
tubes.
6. The magnetization device in accordance with claim 4, wherein
said at least one disk has a central opening for receiving a
measurement tube of a nuclear magnetic flow meter.
7. The magnetization device in accordance with claim 4, wherein
longitudinal axes of the receiving tubes are aligned parallel to a
central longitudinal axis of a passage for receiving a measurement
tube of a nuclear magnetic flow meter.
8. The magnetization device in accordance with of claims 4, wherein
at least one of the receiving tubes is at least partially made of a
material which influences a magnetic field.
9. The magnetization device in accordance with claim 4, wherein at
least one of the receiving tubes is arranged in the carrier in a
manner enabling said at least one tube to be turned around a
longitudinal axis thereof for influencing the magnetic field and
wherein means are provided for fixing said at least one tube in a
plurality positions to which said at least one tube is
turnable.
10. The magnetization device in accordance with claim 1, wherein
the carrier encompasses a plurality profile bodies, the cross
sectional profile of each of the profile bodies being constant
along a longitudinal axis of the respective profile body, and
wherein, in at least one of the profile bodies, at least one hollow
profile accommodates at least one of the permanent magnets.
11. The magnetization device in accordance with claim 10, wherein
the profile bodies are extruded profile bodies.
12. The magnetization device in accordance with claim 10, wherein
the longitudinal axes of the profile bodies are aligned parallel to
a longitudinal axis of a passage for receiving a measurement tube
of a nuclear magnetic flow meter.
13. The magnetization device in accordance with claim 12, wherein
said profile bodies are detachably connected by at least one
positively shaped connecting profile on a first of the profile
bodies and at least one negatively shaped connecting profile on a
second of the profile bodies and wherein the positive and the
negative connecting profiles are shaped such that, in a connected
state thereof, a translational movement of the positive and
negative connecting profiles relative to one another is possible
only along one axis.
14. The magnetization device in accordance with claim 10, wherein
the carrier is a yoke for guiding magnetic backflow generated by
the permanent magnets.
15. The magnetization device in accordance with claim 1, wherein
the permanent magnets are arranged by the carrier as a Halbach
array.
16. The magnetization device in accordance with claim 1, wherein
the carrier is made of at least one material selected from the
group comprised of an aluminum alloy, a ceramic, a glass fiber
composite material and a plastic.
17. The magnetization device as claimed in claim 1, wherein at
least one of the hollow profiles has a rotatable adapter tube
therein, the adapter tube being fixable against rotation in plural
positions, and wherein an inner hollow profile for accommodating at
least one of the permanent magnets is provided in the adapter tube.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation-in-part of commonly
owned, co-pending U.S. patent application Ser. No. 13/676,685.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to a magnetization device for
permeation of a multiphase fluid flowing through a measurement tube
of a nuclear magnetic flow meter with a magnetic field which is
homogenous at least in one plane, with a plurality of permanent
magnets for generation of a magnetic field and with a carrier, the
carrier having at least one magnet receiver, each of the magnet
receivers accommodating at least one of the permanent magnets, the
shape of the magnet receivers and of the permanent magnets allowing
movement of the permanent magnets only in one direction in the
magnet receivers and the permanent magnets held by the magnet
receivers being arranged by the magnet receivers with reference to
the magnetic field.
[0004] 2. Description of Related Art
[0005] A nuclear magnetic flow meter determines the flow of the
individual phases of a multiphase fluid, the flow velocities of the
individual phases and the relative proportions of the individual
phases in the multiphase fluid in the measurement tube by measuring
and evaluating the voltage induced by the nuclear magnetic
resonance of the multiphase fluid into a suitable sensor. The
measurement principle of the nuclear magnetic resonance is based on
the property of atomic nuclei with a free magnetic moment to
precess to the nuclear spin in the presence of a magnetic field.
The precession of the vector representing the magnetic moment of
the atomic nucleus takes place around the vector representing the
magnetic field in place of the of atomic nucleus, the precession
inducing a voltage into the sensor. The frequency of precession is
called the Larmor frequency .omega..sub.L and is computed according
to .omega..sub.L=.gamma.B, .gamma. being the gyromagnetic ratio and
B being the amount of the magnetic field strength. The gyromagnetic
ratio y is maximum for hydrogen nuclei, for which reason especially
fluids with hydrogen nuclei are suited for nuclear magnetic flow
meters.
[0006] A multiphase fluid composed essentially of crude oil,
natural gas and salt water is delivered from an oil source.
So-called test separators branch off a small part of the delivered
fluid, separate the individual phases of the fluid from one another
and determine the proportions of the individual phases in the
fluid. Test separators are expensive, cannot be installed under the
sea and do not allow real-time measurements. In particular, test
separators are, however, unable to reliably measure crude oil
proportions smaller than 5%. Since the crude oil proportion of each
source drops continuously and the crude oil proportion of a
plurality of sources is already less than 5%, it is currently
impossible to exploit these sources.
[0007] Both crude oil and also natural gas and salt water contain
hydrogen nuclei, for which, as already mentioned, the gyromagnetic
ratio y is maximum. Nuclear magnetic flow meters are therefore
suited especially for use on oil sources, also undersea directly on
the source on the sea bed, but are not limited to this application.
Other applications arise, for example, in the petrochemical or
chemical industry. Branching off of the fluid is not necessary, and
the entire fluid is measured in real time. Compared to test
separators, nuclear magnetic flow meters are more economical and
require less maintenance and can also especially reliably measure
crude oil proportions less than 5% in the fluid, as a result of
which the further exploitation of a host of oil sources becomes
possible for the first time.
[0008] It is immediately apparent from the equation for computing
the Larmor frequency .omega..sub.L that the Larmor frequency
.omega..sub.L is proportional to the magnetic field strength B, and
thus, the magnetic field strength B also acts directly on the
voltage induced into the sensor. Heterogeneities in the magnetic
field therefore reduce the measurement quality of nuclear magnetic
flow meters, for which reason the task of the magnetization device
is the permeation of the fluid with a magnetic field which is
ordinarily homogeneous within the measurement tube. The required
measurement accuracy determines the necessary homogeneity of the
magnetic field. Often measurement methods are used which use a
known gradient in the magnetic field so that the magnetic field is
constant only in one plane.
[0009] U.S. Pat. No. 7,872,474 B2 discloses a magnetic resonance
based apparatus and method to analyze and measure bi-directional
flow that utilizes a stack of disks, formed of a plurality of bar
magnets, which forms a hollow cylindrical permanent magnet, the
magnetic field being homogeneous in the cylindrical interior of the
magnet. The magnets of each disk are held between rings of
non-magnetic material and fixed by the screws that are also made of
non-magnetic material the discs of magnets piled up and held by
non-magnetic screws.
[0010] In each individual disk of magnets forms a Halbach array.
The important feature of a Halbach array is that the magnetic field
forms largely on one side of the Halbach array, here, in the
interior of the cylindrical magnet, and on the other side, only a
very weak magnetic field forms, here, in the external space of the
cylindrical magnet Since a strong magnetic field is required for
high voltages induced into the sensor by the precession of the
hydrogen atoms contained in the fluid, correspondingly strong bar
magnets are used. Due to the plurality of bar magnets which are
arranged tightly in each of the magnet disks, the introduction of
the bar magnets into the magnet receivers is associated with a high
expenditure of force. Moreover, the resulting magnetic field is
initially not homogenous enough, for which reason the magnetic
field must be made homogeneous by manipulation on each of the bar
magnets. This process is called shimming. The introduction and
shimming of the numerous bar magnets mean a considerable production
and time expenditure, which is accompanied by the corresponding
costs.
SUMMARY OF THE INVENTION
[0011] The primary object of the present invention is to devise a
magnetization device with reduced production and time expenditure
which will achieve sufficient homogeneity of the magnetic field
that permeates the fluid.
[0012] The magnetization device in accordance with the invention in
which the aforementioned object is achieved is, first of all,
essentially characterized in that the magnet receivers are made as
hollow profiles.
[0013] A hollow profile can be economically produced with various
inner cross sectional contours which are perpendicular to the
longitudinal axis of the hollow profile. For example, the inner
cross sectional contour of a channel-shaped hollow profile is
rectangular and one of the outer cross sectional contours of the
permanent magnets is likewise rectangular and is dimensioned such
that the permanent magnets can be moved in the hollow profile along
only the longitudinal axis of the hollow profile, therefore are
form-fit except for the longitudinal axis. The length of the hollow
profile in this example is dimensioned such that a plurality of
permanent magnets can be introduced. It is immediately apparent
that the fixing of the permanent magnets by pushing the permanent
magnets into these hollow profiles means a much lower production
and time expenditure than the fixing of the permanent magnets with
screws between a pair of rings as in the above described prior art.
The complex stacking of the disks of individual magnets is replaced
by a simple carrier for accommodating the hollow profiles, the
carrier aligning the hollow profiles such that the fluid is
permeated by a sufficiently homogenous magnetic field.
[0014] In one preferred embodiment of the magnetization device in
accordance with the invention, the friction in the movement of the
permanent magnets in the hollow profiles is reduced by lining of
the hollow profiles, for example, with a polytetrafluoroethylene
(PTFE) coating on the inner surfaces of the hollow profiles. The
reduced friction distinctly reduces the expenditure of force for
introducing the permanent magnets into the hollow profiles. After
introducing the permanent magnets into the hollow profiles, the
permanent magnets can be fixed in the hollow profiles by a first
liquid adhesive and then a hardening substance. Sealing compounds,
for example, are possible for this purpose.
[0015] In another preferred embodiment of the magnetization device
in accordance with the invention, the carrier has plurality of
receiving tubes. In each of the receiving tubes, a hollow profile
is formed for accommodating at least one of the permanent magnets.
The material for the receiving tubes can be a glass fiber composite
material since it is easily possible in this material to form, for
example, rectangular hollow profiles in the production process.
Then, permanent magnets with a conventional rectangular cross
section can be introduced into the rectangular hollow profiles so
that the permanent magnets in the hollow profile move only along
the longitudinal axis of the hollow profile, but cannot turn around
the longitudinal axis of the hollow profile.
[0016] As the holder of the receiving tubes, the carrier can have
at least one disk with receivers for the receiving tubes in which
there is, preferably, a penetration for the measurement tube.
Usually the receiving tubes of a magnetization device are of the
same length so that the holder of the receiving tubes can be a disk
on each end of the receiving tubes. The carrier then is comprised
essentially of the receiving tubes and the two disks. If there is
to be a homogenous magnetic field in the measurement tube along the
longitudinal axis of the measurement tube, the alignment of the
longitudinal axes of the receiving tube parallel to the
longitudinal axis of the measurement tube is possible. Often, the
permanent magnets are located in the receiving tubes as a Halbach
array.
[0017] In another preferred exemplary embodiment of the
magnetization device in accordance with the invention which is a
development of the preceding exemplary embodiment, at least one of
the receiving tubes is produced partially from a material which
influences the magnetic field. For example, if a material having
good magnetic conductivity is used in the receiving tubes on the
poles of the permanent magnets, the resulting magnetic field can
thus be advantageously influenced with respect to a homogenous
magnetic field in the measurement tube. In addition or
alternatively, the receiving tubes can be arranged in the carrier
to be able to rotate around their longitudinal axis for
advantageously influencing the homogeneity of the magnetic field in
the measurement tube and then fixed against rotation. The rotation
of the receiving tube is a first shimming of the magnetic
field.
[0018] In another quite especially preferred configuration of the
invention, the carrier encompasses at least one profile body, the
profile bodies preferably being extrusion profile bodies. The
cross-sectional profile of each of the profile bodies is constant
along the respective longitudinal axis of the profile body, and in
at least one of the profile bodies, at least one hollow profile is
made to accommodate at least one of the permanent magnets.
Preferably, here the hollow profiles are also made for
accommodating rectangular permanent magnets such that the permanent
magnets introduced into one of the hollow profiles can move along
the longitudinal axis of the hollow profile, but cannot turn around
the longitudinal axis of the hollow profile. Material for the
profile bodies can be, for example, aluminum alloys or ceramics.
For permeation of the measurement tube with a homogeneous magnetic
field along the longitudinal axis of the measurement tube, again,
an alignment of the longitudinal axes of the profile bodies
parallel to the longitudinal axis of the measurement tube is
recommended.
[0019] In another preferred embodiment of the magnetization device
in accordance with the invention, at least one of the hollow
profiles in at least one of the profile bodies of the carrier is
made such that there is an adapter tube in this hollow profile that
is able to rotate and the adapter tube can be fixed against
rotation. In each of the adapter tubes, a hollow profile for
accommodating at least one of the permanent magnets is made. The
rotation of the adapter tube is a first shimming to improve the
homogeneity of the magnetic field in the measurement tube.
[0020] In another quite especially preferred embodiment of the
magnetization device of the invention in accordance with the
invention, the carrier comprises at least two profile bodies and
two profile bodies at a time are detachably connected by at least
one positively shaped connecting profile on the first profile body
and at least one negatively shaped connecting profile on the second
profile body. The positive and the negative connecting profile are
shaped such that two connected profile bodies can execute
translational movement against one another only along one axis. By
this type of connection, the profile bodies can be easily arranged,
for example, around the measurement tube, and thus, the
magnetization device can be easily installed.
[0021] In another special embodiment of the magnetization device in
accordance with the invention, the carrier which contains at least
one profile body is made as a yoke for guiding the magnetic
backflow generated by the permanent magnets. The cross sectional
profiles of each of the profile bodies are constant along the
respective longitudinal axis of the profile body and in at least
one of the profile bodies there is at least one hollow profile for
accommodating at least one of the permanent magnets. The guidance
of the magnetic backflow is an alternative to the arrangement of
the permanent magnets as a Halbach array. Material at least for the
yoke can be one with high magnetic conductivity.
[0022] In particular, there are a plurality of possibilities for
configuring and developing the magnetization device in accordance
with the invention as will be apparent from the following
description of preferred exemplary embodiments in conjunction with
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] FIG. 1 is an exploded perspective view of a first exemplary
embodiment of the magnetization device in accordance with the
invention,
[0024] FIG. 2 is a perspective view of second exemplary embodiment
of the magnetization device in accordance with the invention with
several rotatable receiving tubes,
[0025] FIG. 3 is an exploded perspective view third exemplary
embodiment of the magnetization device in accordance with the
invention with a carrier for several extrusion profile bodies and
with a rotatable adapter tube, and
[0026] FIG. 4 shows a fourth embodiment with a carrier of several
extrusion profile bodies, in an exploded diagram.
DETAILED DESCRIPTION OF THE INVENTION
[0027] FIG. 1 shows the essential components of a magnetization
device 1 in accordance with the invention; there are a plurality of
permanent magnets 2 and a carrier 3 made of nonmagnetic material.
The primary components of the carrier 3 are a plurality of
receiving tubes 5 in the form of hollow profiles 4, two disk rings
6 with a central opening 7 for a measurement tube and with
receivers 8 for the receiving tubes 5 and two end disk rings 9
which also have a central opening 7 for the measurement tube. In
FIG. 1, not all receiving tubes 5 are visible in order to be able
to show the permanent magnets 2 as well.
[0028] In each of the receiving tubes 5, eight permanent magnets 2
of the same length are introduced, the cross-sectional contour of
these permanent magnets 2 being rectangular and form-fit with the
hollow profiles 4 so that the permanent magnets 2 can be moved in
one of the hollow profiles 4 only along the longitudinal axis of
the hollow profile 4, but cannot turn around the longitudinal axis
of the hollow profile 4. The permanent magnets 2 can be divided
into groups with cross-sectional areas of different size, as a
result of which the permanent magnets 2 have different magnetic
field strengths.
[0029] The receivers 8, which are provided in the disk rings 6
which have been screwed to the end disk rings 9, arrange the
receiving tubes 5 equipped with the permanent magnets 2 around the
measurement tube such that the permanent magnets 2 form a Halbach
array. The receiving tubes 5 are arranged essentially in two rings
around the measurement tube and are fixed by long screws which are
not shown here and which connect the two end disk rings 9 to one
another and draw the two end disk rings 9 toward one another. A
carrier known from the prior art for the same arrangement of the
permanent magnets 2 requires sixteen disk rings 6, two disk rings 6
for each of the eight rings of the permanent magnets 2 so that the
reduced cost associated with the present invention is quite
apparent.
[0030] The exemplary embodiment of the magnetization device 1 in
accordance with the invention which is shown in FIG. 2 differs from
the exemplary embodiment which is shown in FIG. 1 essentially by
the ability of several receiving tubes 5 to be turned around their
longitudinal axis. Since the magnetic field strengths and
directions of the individual permanent magnets 2 are subject to
inevitable fluctuations by the production process of the permanent
magnets 2, even in an optimum arrangement of the permanent magnets
2 by the carrier 3, heterogeneities of the resulting magnetic field
in the measurement tube arise. The heterogeneities can be reduced
by rotating individual receiving tubes 5.
[0031] The outer cross sectional contour of the rotatable receiving
tubes 5 perpendicular to their longitudinal axis is circular and
the pertinent receivers 8 in the disk rings 6 are accordingly
circular and form-fit to the receiving tubes 5. Each of the
rotatable receiving tubes 5 is provided with a rotation device 10
for rotation and fixing thereof. Each of the rotation devices 10
includes two opposite pins for turning and two opposing screws for
fixing of the respective receiving tube 5. Accordingly, there are
sets of four longitudinal holes in the end disk ring 9 that are
arranged concentrically around the longitudinal axis of each of the
rotatable receiving tubes 5.
[0032] FIG. 3 shows a magnetization device 1 in accordance with the
invention with the carrier 3 assembled essentially from several
extrusion profile bodies 11 produced from an aluminum alloy. All
extrusion profile bodies 11 have the same length and each of the
extrusion profile bodies 11 has a plurality of hollow profiles 4.
The inner cross sectional contour of each of the hollow profiles 4
perpendicular to the longitudinal axis of the corresponding hollow
profile 4 is made rectangular, not all cross-sectional contours of
the extrusion profile bodies 11 being closed, i.e., some have
channel-shaped open contours. The open contours, in the assembled
state, are closed by the other extrusion profile bodies 11.
[0033] The permanent magnets 2 all have the same length so that the
same number of permanent magnets 2 is introduced into each of the
hollow profiles 4, and they can be divided into groups with
rectangular cross-sectional areas of different sizes perpendicular
to their longitudinal axis, as a result of which the permanent
magnets 2 have different magnetic field strengths. The permanent
magnets 2 which have been introduced into one of the hollow
profiles 4 cannot turn around the longitudinal axis of the
corresponding hollow profile 4, the inner cross sectional contour
of the hollow profile 4 perpendicular to the longitudinal axis of
the hollow profile 4 not being equal to the outer cross sectional
contour of the permanent magnets 2 which have been introduced into
the hollow profile 4.
[0034] Optionally, as shown for the upper the cylindrical extrusion
profile body 11 in FIG. 3, at least one of the hollow profiles 4
can have an a rotatable adapter tube 13 therein, the adapter tube
being rotatable about the longitudinal axis of the respective
hollow profile 4 and being fixable against rotation in plural
positions. The adapter tube 13 has an inner hollow profile for
accommodating one or more of the permanent magnets 2. Rotation of
the adapter tube 13 can provide a first shimming of the magnetic
field and advantageously improve the homogeneity of the magnetic
field in the measurement tube.
[0035] In the cylindrical extrusion profile body 11, concentrically
along the longitudinal axis of the cylindrical extrusion profile
body 11 there is an opening 7 for the measurement tube and the
other four extrusion profile bodies 11 are arranged around the
cylindrical extrusion profile body 11 so that the longitudinal axes
of the hollow profiles 4 are aligned parallel to one another and
parallel to the longitudinal axis of the cylindrical extrusion
profile body 11. The permanent magnets 2 are arranged in the
carrier 3 such that they form a Halbach array.
[0036] Each pair of the extrusion profile bodies 11 have a first
extrusion profile body 11 with a positive connecting profile 12a
and a second extrusion profile body 11 with a negative connecting
profile 12b. The outer cross-sectional contour perpendicular to the
longitudinal axis of the positive connecting profile 12a and the
inner cross-sectional contour perpendicular to the longitudinal
axis of the negative connecting profile 12b are shaped to form-fit
with each other and are made such that, in the connected state,
only mutual movement of the two extrusion profile bodies 11 along
the longitudinal axis of the positive connecting profile 12a is
possible.
[0037] A movement of the permanent magnets 2 in the hollow profiles
4 along the longitudinal axis of the cylindrical extrusion profile
body 11 and a movement of the extrusion profile bodies 11 relative
to one another along the longitudinal axis of the cylindrical
extrusion profile body 11 are inhibited by two end disk rings 9,
which are not shown here. In each of the two end disk rings 9,
there is a central opening for the measurement tube and there are
bores for the penetration of screws as shown in FIG. 1.
Accordingly, in the end faces of the extrusion profile bodies 11
there are threads for screw connection to the end disk rings 9.
[0038] FIG. 4 shows another magnetization device 1 in accordance
with the invention with the carrier 3 assembled essentially from
several extrusion profile bodies 11 which have been produced from a
plastic in an injection molding process. The magnetization device 1
differs from the magnetization device 1 shown in FIG. 3 essentially
by the replacement of the one-piece cylindrical extrusion profile
body 11 by a multi-part extrusion profile body 11.
[0039] Compared to the magnetization devices 1 in accordance with
the invention which are shown in FIGS. 1 and 2, the production
effort and thus also the costs are again reduced in the
magnetization devices 1 shown in FIGS. 3 and 4.
[0040] In part plastic, in part ceramic have been addressed above
as the material to be used. Instead, ceramic or aluminum can also
be used.
* * * * *